Modélisations et Expérimentations en Microscopie à Force Atomique Dynamique en Ultra Vide

Abstract : It was almost fifteen years since the Dynamic force microscopy (DFM or Dynamic AFM) was born (Albrecht, 1991). Since the first atomic resolution image (F. J. Giessibl, 1995), progress in this near field technique allows nowadays to manipulate atoms at room temperature (Oyabu, 2005) on metallic or insulator surfaces. Understanding the behavior of this complex machine and improving the settings of the many control blocks is one of the objective of this thesis work. For this purpose, an analytical formalism coming from the non linear Automatism methods (J. Ch. Gille, 1956) will be introduce to treat in an natural way the feedback loops of the machine and also to treat the tip-surface interaction as a transfert function. A powerful numerical tool will validate our theoretical approach. In a second step, the essential role of the probe and its caracterization will be treat through a simple experimental original method. This method is based on the study of the changes of the resonance properties of the oscillating probe above insulator and metallic surfaces. The conservative forces at long range like electrostatic or van der Waals forces will be measured. The short range forces essentially chemical interactions will be showed by the measurement of the dissipated energy by the oscillating probe against the tip-surface distance. We will finish this study by showing experimentally on a MoS2/gold clusters/octanedithiol molecules system the large versatility of the microscope. Indeed, this near field system thanks to its apparent complexity keeps a lot of degrees of freedom to the user to investigate a such physical and chemical device. Outlooks will be proposed to improve the stability and the capability of resolution of the tip which would allow to make perennial this near field technique.
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Jérôme Polesel. Modélisations et Expérimentations en Microscopie à Force Atomique Dynamique en Ultra Vide. Physique [physics]. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨tel-00009666⟩

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